Centering means for drilling machine spindles



May 28, 1940. G. MCJLLER ,2

CENTERING MEANS FOR DRILLING'MACHINE SPINDLES Original Filed Jan. 4,1937 g INVENTORU,

ATTORNEY. 1

Patented May 28 1940 PATENT OFFICE CENTERING MEANS Foa DRILLING MACHINEsrmnnns Georg Miiller, Berlin-Neukoelln, Germany, as-

signor to Herbert. Ilindner; Berlin-Wittenau',

Germany Original application January 4, 1937, Serial No.

119,042. 11, 1938, Serial August3, 1936 Divided allqid this applicationOctober 234,456. In Germany 4 Claims. (Cl. v'i-si This invention relatesto centering means attached to a drill spindle to insure that its axisaccurately intersects the work at a desired place say at the center of ahole to be drilled. More particularly, the invention relates to a deviceof this character especially adapted for use in coordinate drillingmachines and wherein optical means are employed for sighting a pointexactly in alinement with the axis of the drill spindle.

Heretofore attempts have been made to provide optical means for thispurpose and in certain of the proposed devices an angled microscope wasfitted to the lower end of the drill spindle, either by providing themicroscopic instrument with a tapered attaching member or by providingsome other means for securing the instrument to the lower end of thespindle. This was found objectionable because it necessitatedapplication and removal of the microscope each time the drill was setand there was thus not only much delay entailed, but-there was greatdanger of injury to the microscope, due to its being constantly handled.

Attempts were made to overcome this difficulty by mounting themicroscope in the hollow spindle .with the eye-piece at the top of thespindle.

While this allowed the microscopeto be made a fixed part of the drill,it introduced other dimculties because the top of the drill spindle inmost coordinate drillingv machines is much higher than the eye of amachinist standing at the drill and the microscope could only be used byclimbing on the drill or on a ladder or box. Therefore, in such cases,it would be impossible for the machinist, to look in the eye-piece ofthe microscope and to manipulate simultaneously the means for efiectingthe adjustment ofthe worktable and the drilling head. 'Furthermore, itwas found advisable, in many machines, to remove the eye-piece duringthe drilling operation, due to the structure and operation of the drivetor the machine. In such cases, therestill existed the dagger ofinjuryto the instrument.

ried by the machine inpermanent operative relation thereto.

..-.- A second important object of the invention. is

provide a novel arrangement of microscope and drill spindle wherein theobject glass is within the hollow drill spindle and the eye-pieceextends laterally. of the spindle, a sight opening being provided in thewall of the spindle and a reflector alined therewith A third importantobject of the invention is to provide a novel arrangement of this kindwherein the line of collimation of the microscope will coincide exactlywith the axis of the spindle and wherein the adjustment of the objectglass to and from the work will be effected by the usual operations oflowering and raising the spindle.

A fourth important object of the inventionv is to provide means wherebythe sight opening in the' spindle wall may be alined with the eye-pieceend of the microscope, its movement to such position being indicated bysuitable index means readily visible to the machinist.

- A fifth important object of the invention is to provide a novelarrangement of this class wherein provision is made to prevent lubricantfrom. the

machine parts finding its way into the micro scope.

A sixth object of theinvention is to provide a device of thisclass'wherein the eye-piece end of the microscope is attached to thefeed sleeve of the spindle.

The subject matter-of this application 'isadivided from applicationSerial No. 119,042 of January 4, 1,937.

With the foregoing and other objects in view, the invention consists inthe details of construction, and in the arrangement and combination ofparts to be hereinafter more fully set forth andtion of a drillingmachine head embodying the invention;

Figure 2 illustrates a section on the line 11-!) of Fig. 1; and Fig. 3illustrates an enlarged frag-,

mentary detail disclosing the mannerof adjusting the line of collimationof.the.microscope with respect to the axis of the drill spindle and itssleeve.

In the embodiment of the invention here disclosed, there is provided atubular or hollow drill bearing 4. In these hearings I. A socket 2a isformed at the upper end of the sleeve 2 and seated in this socket is anut 2b which is screwed on the upper end. of the spindle and serves tohold it in position for a clse.running fit of its journals inthebearings 3 and 4. These parts are carefully fitted to prevent anyeccentricity of movement of the drill spindle, that is, to insure thatthe axis of the drill, when held in the socket lb, will coincide withthe axis of rotation of the spindle. On the upper end of the spindle isfitted a drive pulley driven by suitable means (not shown), the spindlebeing held to slide vertically through thepulley, while revolubletherewith, by spline means la. The sleeve 2 is provided with alongitudinally extending rack I wherewith meshes a pinion 6 carried on ashaft 6a rotated by means presently described. By

-means of this rack and pinion the sleeve 2 is raised and lowered.

There is fixed on the shaft 6a a worm wheel ll whercwith meshes a worml0 rotated by an adjusting handle 9 mounted on the head 8.

, Mounted in the spindle f is an object glass tube l2 which carries atits lower end an object glass I3 while a reflecting device H, such as amirror or prism, is located at the upper end of the tube l2.-

This tube is heldin proper position by suitable means such as the pinsl5 and secured against rotation by a set-screw l6 screwed through thewall of the spindle l and engaging the side of the tube l2. In the,spindle l is provided a sight opening l9 which is positioned so thatlight entering the tube I2 through the glass 13 will be reflectedthrough the sight opening l9. In the sleeve 2 is also formed a sightopening which is on a vertical level with the sight opening l9. In orderto determine when the sight opening 19 is rotatably in registry with thesight opening 20, there is provided on the lower end of the spindle I acollar If which is provided with an index mark 26 which, when broughtinto registry with an index 21, indicates that the two sight openingsare alined.

Packing rings 2| and 22 are arranged between the spindle and sleeveabove and below the sight opening IS in order to prevent lubricant usedbetween the spindle and sleeve from finding its way into the microscope.

As shown in Figs. 1 and 2, there is provided a microscope tube Ild whichis screwed into the opening 20a of the sleeve. 2. This tube is providedwith an erecting lens Ila, sliding eye-piece tube l'lb, eye-piece ,lens'"0 and cross-hair ring I8. The housing} for the sleeve 2 is provided,

with agverti'cal slot 30 wherethrough the tube lld projects. 'lhe tubel-ld may thus slide vertically with the sleeve as the latter isadjusted. v

With this arrangement, it will be seen that the 'lightrays R passthrough the microscope from the center point C and by proper adjustmentof the sleeve 2 and eye-piece l'lb the center point C may bebroughtsharply into focus in the field of vision of the microscope; Thenby manipulating the table feeds of the machine, this point C may bebrought into registry with the intersection of the lines I8 and thus tolie in the line of. collimation of the microscope and axis of rotationof the spindle and drill tool.

There have thus been provided simple and efficient means of the kinddescribed and for the purposes specified.

The details of the hair ring l8 are illustrated in Fig. 3 and the ringl8 carries a transparent plate 18b having a pair of hair-lines lBainserted thereon. This ring may be adjusted to bring the intersection ofthe lines I8a into the line of collimation of the microscope by meansof. three setscrews 28 passing through the tube Nd and engaging the ringat intervals.

It is obvious that changes may be made in the form and construction ofthe invention without departing from the principles involved. It is nottherefore desired to confine the invention to the exact. form shown anddescribed, but it is desired to include all forms which come within thescope of the appended claims.

I claim:

1. In combination with a drilling machine having a head. carrying avertically movable spindle sleeve and having a drill spindle rotatablymounted in said sleeve, said sleeve and drill spindle having alinablesight openings and cooperating means being provided on the head andspindle for indicating alinement of said openings,

a tube fixed inthe hollow spindle and having an opening registering withthe sight opening in the spindle, an object glass at the lower-end of,said tube; a reflector above said glass and opposite the tubeopening,.said head having a vertical slot therein, an eye-pieceextending transversely of said slot and alined with the sight opening inthe sleeve, and means for connecting the eyepiece'and' sleeve to causethe two to move together.

2. In combination with a drilling machine having a head carrying avertically movable spindle sleeve and having a drill spindle rotatablymounted in said sleeve, said sleeve and drill spindle having alinablesight openings and cooperating means being provided on the head andspindle for indicating alinement of said openings, a tube fixed in thehollow spindle and having an opening registering with the sight openingin the spindle, an object glass at the lower end of. said tube, areflector above-said glass and opposite thetube opening,.said headhaving a vertical slot operating means being provided on the head andspindle for indicating alinement of said openings,

a tube fixed in the hollow spindle and having an opening registeringwith the sight opening in the spindle, an object glass at the lower endof. said tube, a reflector'above said glass and opposite the tubeopening, said head having a vertical slot therein, an eye-pieceextending transversely of said slot andalined with the sight opening inthe sleeve, meansfor connecting the eye-piece ,and sleeve to cause thetwo to move together,

and packing means above and below the sight opening between the'drillspindle and sleeve.

opening stering with the sight opening in'the spindle, an object glassat the lower end or said tube, a reflector above said glass and oppositethe tube opening, said head having a vertical slot therein, an'eye-piece extending transversely of said slot and alined with the sightopening in the sleeve, a screw thread. connection between the eye-pieceand said sight opening in the sleeve,

and packing means above and below the sight opening between the drillspindle and sleeve.

GEORG Mom. 10

